Combined trammel and calipers



(No Model.)

B. LINDNER.

COMBINED TRAMMEL AND GALIPERS.

No. 497,802. Patented May 23, 1893.

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UNITED STATES PATENT OFFICE.

EMERANN LINDNER, OF AKRON, OHIO.

COMBINED TRAMMEL AND CALIP ERS.

SPECIFICATION forming part of Letters Patent No. 497,802, dated May 23,1893.

Application filed December 5. 1892. Serial No. 454,190- (No model.)

To all whom it may concern:

Be it known that I, EMERANN LINDNER, a citizen of the United States,residing at Akron, in the county of Summit and State of Ohio, haveinvented a new and useful Combination Trammel and Calipers, of which thefollowing is a specification.

My invention has relation to improvements in that class of calipers usedby artisans, wherein it is desired to combine in a single tool thebenefits of many without the corresponding increase in the number ofparts. And the objects of my invention are to produce calipers whichshall be strong, serviceable and accurate, yet capable of sensitiveadjustment and which by aslight interchange of parts may be utilized asan entirely different class of calipers and further to combine withthese a trarnmel suitable for mechanics or artisans use.

To the aforesaid objects my invention consists in the peculiar and novelconstruction, combination and arrangement of parts hereinafterdescribed, and then specifically claimed, reference being had to theaccompanying drawings, forming a part of this specification.

In the accompanying drawings in which similar reference letters indicatelike parts in the different figures, Figure 1, represents a sideelevation of my improved calipers. Fig. 2,is a central longitudinalsection of the main frame. Fig. 3, is a plan view.

In the drawings A, B, O, D, is a hollow frame preferably of metal andgenerally made with open sides, leaving cross-bars, O, N, and P, and endpieces Q, R, all made integral. In suitable bearings in the cross-bar,N, and revolubly mounted is a nut Z,through the center of which andconcentric therewith is a shaft, Y, and the ends whereof arescrewthreaded. Sliding in the frame, A, B, C, D, are bars, E, F, theinner ends of which are tapped to engage the ends of the screwthreadedshaft, Y, and to be drawn in or forced out by the turning of the shaft,Y, by means of the nut, Z. The outer ends of the bars, E, F,areperforated to receive the trammel points or caliper legs. The arms, F,are held firmly wheresoever desired in the frame, A, B, O, D, by setscrews, 11, e, and the trammel arms by set screws, h, i, placed on theends of bars, E, E. By slight change of the caliper legs and trammelpoints this invention can be used as inside, outside and hermaphroditecalipers as well as a trammel.

What I desire to secure by Letters Patent 1. In a combined trammel andcalipers the combination of a central frame, having a revolubly mountednut and screw-threaded shaft arranged to simultaneously actuate slidingbars in said frame; the ends of said bars perforated to receive trammelpoints or caliper legs, said legs having one pointed and one curved endall combined substantially as shown and described.

2. In a combined trammel and calipers, the I

